Move reencode logic for screenshare bitrate overshoot from generic

webrtc/modules/video_coding/generic_encoder.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 104 matching lines @@
   bool SupportsNativeHandle() const;
 
  private:
   rtc::RaceChecker race_checker_;
 
   VideoEncoder* const encoder_ RTC_GUARDED_BY(race_checker_);
   VCMEncodedFrameCallback* const vcm_encoded_frame_callback_;
   const bool internal_source_;
   rtc::CriticalSection params_lock_;
   EncoderParameters encoder_params_ RTC_GUARDED_BY(params_lock_);
-  bool is_screenshare_;
   size_t streams_or_svc_num_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_GENERIC_ENCODER_H_